Edit
While in this case using Quasars LocalStorage utility would probably more preferable because of one less dependency, I just talked to Raz and of course there is a simple solution. :D

The Vue.use() statement is just there to tell Vue.js to use this plugin, so just import the plugin in your router file and use it there. There is also no need to call Vue.use() only in Quasar plugins, you can also call it in your router.

Furthermore it is totaly possible to export stuff in your Quasar plugins (in the end they are jsut plain JS files which export a function which Quasar runs on initialization) so you can export stuff in your plugin and use it somewhere else.